Abstract
The quasiparticle spectral function is calculated for the 2D Hubbard model of Bi2212 with n\ensuremath{\sim}0.9. For momenta k\ensuremath{\gtrsim}${\mathit{k}}_{\mathit{F}}$ we obtain dips and satellite peaks at energies \ensuremath{\omega}0 which are caused by strong scattering of quasiparticles on antiferromagnetic spin fluctuations. These structures, which may be observable, become very pronounced below ${\mathit{T}}_{\mathit{c}}$ even for momenta k lying along the node of the ${\mathit{d}}_{{\mathit{x}}^{2}\mathrm{\ensuremath{-}}{\mathit{y}}^{2}}$ wave gap. For k along the antinode of the gap we obtain below ${\mathit{T}}_{\mathit{c}}$ a shift of the quasiparticle peak and a dip in qualitative agreement with ARPES measurements on Bi2212. \textcopyright{} 1996 The American Physical Society.
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